Which packaging innovation from the 1960s revolutionized soft drink distribution and is credited with saving millions in shipping costs due to its interlocking design?

Product packaging has evolved dramatically throughout history, often reflecting technological innovations, cultural shifts, and changing consumer needs. Some packaging breakthroughs fundamentally transformed entire industries and how consumers interact with products. This trivia question explores a pivotal moment in packaging history that revolutionized a major consumer goods category and changed shopping behaviors forever.

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The pull-tab aluminum can
The plastic two-liter bottle
The Cluster-Pak cardboard carrier
The 'waist-pinched' contour carton (Hi-Cone six-pack ring)